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Table 3 Prevalence of elevated antibody titers against a canine influenza H3N2, a seasonal influenza H1N1, and A(H1N1)pdm09 among cats by hemagglutination inhibition (HI) assay, northeastern China a

From: Serological report of pandemic (H1N1) 2009 infection among cats in Northeastern China in 2012-02 and 2013-03

HI assay virus Number Antibody titer Number of specimens with titers ≥1:40 (%)  
<1:20 1:20 1:40 1:80 ≥1:160 OR(95% CI)b
  H3N2 1140 704 325 51 24 36 111 (9.7) Reference
  H1N1 1140 911 205 16 5 3 24(2.1) 5.02[3.20-7.86]
  Pdm09 1140 518 382 123 52 65 240(21.5) 0.40[0.32-0.52]
  1. aH1N1 = A/Brisbane/59/2007(H1N1); H3N2 = A/canine/Guangdong/2/2011(H3N2); Pdm09 = A/California/7/2009(H1N1pdm09).
  2. bThe statistical tests about the association between difference virus strains; OR, odds ratio; CI, confidence intervals.